Section 4
Venting / Ducting
General Requirements
Heater must be vented in accordance with specification ANSI Z223.1
-latest revisions. Partial information relating to this specification is provided in this section with regard to size and configurations for venting arrangements (see Figures 12, 13, 14, 15, 16). For complete information consult ANSI Z223.1 - latest revision and applicable local codes. Use the following guidelines to help insure an adequate, safe venting arrangement.
a)Be sure that method selected for venting heater complies with all codes as required for each particular location.
b)Exhaust end of heater will accept a four (4”) inch flue pipe using the flue pipe adapter.
c)Heater may be vented to the outdoors either vertically or horizontally.
d)If heater is to be vented horizontally:
1)Vent must exit building not less than seven (7’) feet above grade when located adjacent to public walkways.
2)Vent must terminate at least three (3’) feet above any forced air inlet located within ten feet (10’).
3)Vent must terminate at least four (4’) feet below, four (4’) feet horizontally from, or one (1’) foot above any door, window, or gravity inlet into any building.
4)Vent terminal shall be located at least twelve (12”) inches from any opening through which vent gases could enter the building.
e)Vent terminal must be beyond any combustible overhang.
f)If condensation in the flue is a problem, the flue length should be shortened or insulated.
g)For vent specifications all of the following conditions must be met.
1)Maximum total vent length allowed in
2)Maximum outside air supply duct allowed
3)Maximum total vent length plus outside air supply length plus extension package shall not exceed sixty
4)Under length conditions 1) through 3) above — a total of two (2) elbows are allowed for vent and outside air supply together. Subtract fifteen (15’) feet per additional elbow from maximum length allowed if more than two (2) elbows are used.
Alternative Arrangements / Optional Equipment for Venting
Unvented Operation
a)Sufficient ventilation must be provided in the amount of 4 CFM per 1,000 BTU/hr. firing rate.
b)Refer to ANSI Z223.1 - latest revision,
c)Use of optional outside combustion air is not
recommended with unvented heaters due to pressure considerations.
Horizontal Venting
a)In combustible or noncombustible walls, use Tjerblund
b)Four (4”) inch O.D. flue pipe is required. Thirty (30’) feet maximum length is recommended. Up to
be used if insulated to prevent excess condensation. (See General Requirements on page 21 for additional information).
c)All flue joints should be sealed using suitable product such as General Electric RTV106 or Permatex
d)Vent terminal should be installed at a height sufficient to prevent blockage by snow.
e)Building materials should be protected from degradation by flue gases.
Vertical Venting a) Four (4”) inch O.D. flue pipe, maximum
b)An insulated thimble may be required to pass through combustible structures (check local codes).
c)All flue joints should be sealed using suitable products (see recommendation for horizontal venting.)
Draft Hood Venting
a)Refer to ANSI Z223.1 - latest revision,
b)Minimum six (6”) inch O.D. vent is recommended.
Common Venting
a)Horizontal run to vent must never exceed 75% of the vertical height of the vent. Refer to ANSI Z223.1 - latest revision,
b)Open area of common vent must equal the sum of the open area of individual vents connected to it. (See chart and diagrams - page 25.)
c)Use double wall vent as required (check codes.)
d)Heaters sharing a common vent must be controlled by the same thermostat.
e)All joints must be sealed using suitable products (see recommendation for horizontal vent - page 24.)
f)Connections to common stack must be positioned to avoid direct opposition between
Enerco enerRadiant® XL Series Heater | 16 | Operating Instructions and Owner’s Manual |
